<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      display: inline-block;

      width: 300px;
      height: 300px;

      /* width */
      /* border-top-width: 10px;
      border-right-width: 20px;
      border-bottom-width: 30px;
      border-left-width: 40px; */
      /* border-width: 10px 20px 30px 40px; */

      /* style */
      /* border-top-style: solid;
      border-right-style: dashed;
      border-bottom-style: groove;
      border-left-style: ridge; */
      /* border-style: solid dashed groove ridge; */

      /* color */
      /* border-top-color: red;
      border-right-color: blue;
      border-bottom-color: green;
      border-left-color: orange; */
      /* border-color: red blue green orange; */

      /* 总缩写属性 */
      border: 10px solid black;
    }
  </style>
</head>
<body>
  
  <div class="box">我是box</div>

</body>
</html>